Plugin init hook

Question

Is there a plugin init hook that runs whenever the plugin is being loaded? I'd like to link the functions for requiring files and defining constants to such a hook if it exists.

Answer 1

There's the plugins_loaded hook for normal Plugins and muplugins_loaded, which runs earlier.

My best advice for hooks is making cross file searches for do_action or dump the content of the all hook with $GLOBALS['wp_filter'][ current_filter() ];.